Low-cost corrosion-resistant unsaturated polyester resin, and preparation method and use thereof

A polyester resin, low-cost technology, applied in the field of low-cost corrosion-resistant unsaturated polyester resin and its preparation, can solve the problems of easy occurrence of defects, decreased physical properties of products, surface defects, etc., and achieves improved acid and alkali corrosion resistance. performance, improve corrosion resistance, improve the effect of aging resistance

Active Publication Date: 2014-03-12
浙江天和树脂有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unsaturated polyester resin produced by such commonly used raw materials and processes has poor corrosion resistance. It shows that the strength of the product decreases greatly under the influence of strong light, alkali, acid and other external influences, and it is very prone to defects. , can not meet the application requirements in some high-end places - for example, some customers have reported that the granite produced by ordinary unsaturated polyester resin has poor corrosion resistance to cement and is used in some high-demand surface laying applications. restricted
[0003] Unsaturated resins contain a large number of unstable ester bonds and benzene rings. As we all know, under conditions such as strong light, alkalinity, and acidity, ester bonds and benzene rings are easy to break, and the products turn yellow and appear on the surface. Defects, deformation, etc., the test results show that the physical properties of the product are seriously reduced

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  • Low-cost corrosion-resistant unsaturated polyester resin, and preparation method and use thereof

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preparation example Construction

[0049] The preparation method of the unsaturated polyester resin is as follows: under the protection of nitrogen, degrade the glycol and PET at 200°C-220°C for 5-8 hours, cool down to 155-165°C after PET is completely degraded, add dibasic anhydride slowly Heat up to 195°C-200°C for polycondensation reaction for 4-5 hours, until the acid value reaches 35-45mgKOH / g, then vacuum treatment under reduced pressure for 1.5-3 hours, the vacuum degree is ≤0.092Mpa, and the optimal time for vacuuming is 1.5-2.5 hours , keep the temperature of the material at 195-200 °C, add additives including polymerization inhibitors after the acid value reaches 17-25 mgKOH / g, cool to 90-110 °C and add diluent to obtain low-cost corrosion-resistant unsaturated polystyrene Ester resin, wherein the additive that adds comprises inhibitor, copper naphthenate solution and paraffin, and inhibitor is common polymerization inhibitor, as hydroquinone, p-benzoquinone etc., and its add-on is 25% of reactant tota...

Embodiment 1

[0052] Corrosion-resistant unsaturated polyester resin reactants are fed by weight, including the following components:

[0053] Diethylene glycol 700g Propylene glycol 250g D33 glycol 400g

[0054]PET 1450g (obtained by polycondensation reaction of terephthalic acid and ethylene glycol)

[0055] Maleic anhydride 750g Phthalic anhydride 450g

[0056] Styrene 1400g Methyl methacrylate 200g

[0057] Its preparation method comprises the following steps:

[0058] According to the above-mentioned dosage, diethylene glycol, propylene glycol, D33 glycol and PET were degraded and reacted for 8 hours under the protection of nitrogen at 200°C, until the PET was completely degraded, the temperature was lowered to 155°C, and maleic anhydride and phthalic anhydride were added slowly Heat up to 200°C for polycondensation reaction for 5 hours, until the acid value reaches 35mgKOH / g, vacuum treatment under reduced pressure for 1.5 hours, keep the material temperature at 200°C, u...

Embodiment 2

[0061] Corrosion-resistant unsaturated polyester resin reactants are fed by weight, including the following components:

[0062] Neopentyl glycol 200g D33 diol 50g

[0063] PET 350g

[0064] Maleic anhydride 150g

[0065] Styrene 150g Methyl methacrylate 100g

[0066] Its preparation method comprises the following steps:

[0067] According to the above-mentioned dosage, degrade neopentyl glycol, D33 diol and PET at 220°C under the protection of nitrogen for 5 hours, until PET is completely degraded, cool down to 165°C, add maleic anhydride and slowly heat up to 195°C for polycondensation reaction 4 hours, until the acid value reaches 45mgKOH / g, vacuum treatment under reduced pressure for 3 hours, keep the material temperature at 195°C, until the acid value reaches 17mgKOH / g, add 70PPM of copper naphthenate solution, 25PPM of p-benzoquinone and 450PPM of paraffin, and cool Add styrene and methyl methacrylate to 110°C to prepare low-cost corrosion-resist...

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Abstract

The invention discloses low-cost corrosion-resistant unsaturated polyester resin, and a preparation method and use thereof, and belongs to the technical field of unsaturated polyester resin. The unsaturated polyester resin is prepared by the following steps: carrying out degradation reaction on polyethylene terephthalate (PET) and dihydric alcohol; carrying out condensation polymerization on the degradation product and dihydric alcohol or binary anhydride; finally diluting the condensation polymer by a diluent, wherein the dihydric alcohol comprises D33 dihydric alcohol and common dihydric alcohol; the diluent is a mixture of methyl methacrylate and styrene. The preparation method of the low-cost corrosion-resistant unsaturated polyester resin disclosed by the invention is simple; the obtained product is in a liquid state at normal temperature, and has higher mechanical property retaining rate, lower bending strength drop rate, and better bending strength than the traditional unsaturated polyester resin under the condition of high-concentration acid and alkali. The low-cost corrosion-resistant unsaturated polyester resin is used for fabricating high-grade corundum, SMC and the like together with an inorganic material, so that the product has good resistance to acid and alkali corrosion, the service life is prolonged, and the market requirements of special purpose products can be met.

Description

technical field [0001] The invention belongs to the technical field of unsaturated polyester resins, and in particular relates to a low-cost corrosion-resistant unsaturated polyester resin and its preparation method and application. Background technique [0002] Ordinary unsaturated polyester resins are generally made of polycondensation of phthalic anhydride, maleic anhydride and propylene glycol, ethylene glycol, diethylene glycol, etc., and diluted with diluents such as styrene, which contain a large amount of relatively unstable A linear polymer compound with ester bonds and unsaturated double bonds. The unsaturated polyester resin produced by such commonly used raw materials and processes has poor corrosion resistance. It shows that the strength of the product decreases greatly under the influence of strong light, alkali, acid and other external influences, and it is very prone to defects. , can not meet the application requirements in some high-end places - for exampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/01C08F212/08C08F220/14C08G63/52C08G63/78C08L51/08
Inventor 邱灵强麻慎荣何炜
Owner 浙江天和树脂有限公司
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